Nonaqueous gel casting using multicomponent concentrated slurries through Michael additive reaction for fabricating silicon nitride dense ceramics

Iijima, Motoyuki; Hasegawa, Kenta; Tatami, Junichi

doi:10.1016/j.apt.2020.12.028

Cited by 3 publications

(2 citation statements)

References 35 publications

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“…Currently, most of the ceramics are produced by molding raw powder, followed by sintering 1–11 . During powder processing, sintering is caused via dynamic mass transfer, resulting in densification and microstructure development.…”

Section: Introductionmentioning

confidence: 99%

“…Currently, most of the ceramics are produced by molding raw powder, followed by sintering. [1][2][3][4][5][6][7][8][9][10][11] During powder processing, sintering is caused via dynamic mass transfer, resulting in densification and microstructure development. Therefore, understanding and controlling sintering is extremely important for producing better ceramics.…”

Section: Introductionmentioning

confidence: 99%

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In situ observation of evolution of internal structure of alumina during sintering by swept‐source OCT

Takahashi

Sakamoto

Tatami

et al. 2021

Int J Applied Ceramic Tech

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In situ observation of sintering of ceramics is important to understand the sintering behavior, including the development of internal structures, and to fabricate ceramics with superior properties. However, there has been no studies thus far on high‐speed in situ observation of the internal structure of green and sintered bodies at high temperatures with micrometer‐scale resolution. Here, we applied swept‐source optical coherence tomography (OCT) to observe the evolution of the internal structure in Al2O3 green bodies during sintering. In situ OCT observations revealed that internal structure changes during sintering, such as the development of density distribution and growth of coarser pores. We could also obtain the sintering shrinkage ratio and relative density from the OCT images. The OCT observation of the internal structure during sintering of green bodies with added or stacked granules of different primary particle sizes confirmed that inhomogeneous regions developed as the densification progressed at high temperatures. These results indicate that in situ observation of the sintering behavior of ceramic green bodies using swept‐source OCT is a novel technique that facilitates real‐time observation of the evolution of the internal structure during sintering.

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Section: Introductionmentioning

confidence: 99%